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Nicotine Can Fuel Breast Cancer, Study Suggests

Nicotine Can Fuel Breast Cancer, Study Suggests

08/24/10

TUESDAY, Aug. 24 (HealthDay News) -- Nicotine may directly promote the development of breast cancer by binding to a certain cell receptor, says a new study.

Many chemicals in tobacco are believed to be carcinogens but little is known about how nicotine might contribute to cancer cell growth. What is known is that when nicotine binds to the nicotinic acetylcholine receptor (nAChR), it promotes smoking addiction.

In this study, Taiwanese researchers analyzed 276 breast tumor samples to determine whether subunits of nAChR were overproduced in breast cancer cells compared with surrounding normal cells.

The researchers found that breast cancer cells consistently overproduced the alpha 9 subunit of nAChR (a9-nAChR) and that production of this subunit was higher in advanced-stage breast cancer than in early-stage cancer. They then conducted laboratory tests that showed reducing levels of a9-nAChR inhibited tumor growth, while increasing levels of the subunit or treating more normal breast cells with nicotine led to the development of cancer characteristics.

"These results imply that receptor-mediated carcinogenic signals play a decisive role in biological functions related to human breast cancer development," concluded Yuan-Soon Ho, of the Taipei Medical University, and colleagues in a news release from the Journal of the National Cancer Institute, which published the study online Aug. 23.

More information

The American Cancer Society has more about the causes of breast cancer.

Copyright © 2010 HealthDay. All rights reserved.

Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.

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